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Date:      Sat, 13 Feb 1999 12:12:39 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Jaye Mathisen <mrcpu@internetcds.com>
Cc:        FreeBSD Questions <questions@FreeBSD.ORG>
Subject:   Re: Ooops, new vinum weirdness...
Message-ID:  <19990213121239.B54333@lemis.com>
In-Reply-To: <Pine.NEB.3.95.990212171938.27256J-100000@schizo.cdsnet.net>; from Jaye Mathisen on Fri, Feb 12, 1999 at 05:26:32PM -0800
References:  <19990213113320.Y54333@lemis.com> <Pine.NEB.3.95.990212171938.27256J-100000@schizo.cdsnet.net>

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On Friday, 12 February 1999 at 17:26:32 -0800, Jaye Mathisen wrote:
>
> On Sat, 13 Feb 1999, Greg Lehey wrote:
>
>> [Format recovered at freebie.lemis.com]
>>
>> On Friday, 12 February 1999 at 16:51:19 -0800, Jaye Mathisen wrote:
>>>
>>> D drive1                State: up       Device /dev/da2c
>>> D drive2                State: up       Device /dev/da3c
>>> D drive3                State: up       Device /dev/da4c
>>>
>>> V vol0                  State: up       Plexes:       2 Size:         11 GB
>>>
>>> P vol0.p0             S State: up       Subdisks:     3 Size:         11 GB
>>> P vol0.p1             S State: up       Subdisks:     3 Size:         11 GB
>>>
>>> S vol0.p0.s0            State: up       PO:        0  B Size:       4000 MB
>>> S vol0.p0.s1            State: up       PO:       16 kB Size:       4000 MB
>>> S vol0.p0.s2            State: up       PO:       32 kB Size:       4000 MB
>>> S vol0.p1.s0            State: up       PO:        0  B Size:       4000 MB
>>> S vol0.p1.s1            State: up       PO:       16 kB Size:	4000 MB
>>> S vol0.p1.s2            State: up       PO:       32 kB Size:       4000 MB
>>>
>>> Isn't plex vol0.p1 kind of useless to me?  Seems like this shouldn't be
>>> allowed.
>>
>> Not at all.  This is very definitely a feature, not a bug.  You have
>> now just mirrored your volume.  Of course, it would be better to
>> mirror on a different set of disks, but it works.
>>
>> BTW, your stripe size (16 kB) is *far* too small.  Somebody pointed
>> out that that was in the man page, but it was wrong.  It's now set to
>> 256 kB.  Unfortunately, you can't change your stripe size online.
>
> Are you telling me that if I had actually newfs'd this, that it would've
> created a mirrored 5.5 GB partition on the same disk?

No.  That's not the way volumes map to plexes.

> I must be stupid, but I just don't see how this config means anything.

I think you need to read the man pages.

> I can't have 2 11GB drives (mirrored or not), since there's only 12GB of
> disk space total.

Oh.  Then you should have got an error message when creating the
additional subdisks.

> If p1.s0, p1.s1, and p1.s2 were different than p0..s0, p0.s1 and p0.s2, in
> any way, then I could see it.

Well, you could if you use the command `vinum list -V.  What does it
say?

Greg
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